Implement selectable tap adapter in Windows

edge.c

@@ -139,7 +139,7 @@ static void help() {
 	 "[-p <local port>] [-M <mtu>] "
 	 "[-r] [-E] [-v] [-i <reg_interval>] [-t <mgmt port>] [-b] [-A] [-h]\n\n");
 
-#ifdef __linux__
+#if defined(N2N_CAN_NAME_IFACE)
   printf("-d <tun device>          | tun device name\n");
 #endif
 

n2n.h

@@ -38,6 +38,7 @@
 #ifdef WIN32
 #include "win32/n2n_win32.h"
 #include "win32/winconfig.h"
+#define N2N_CAN_NAME_IFACE 1
 #undef N2N_HAVE_DAEMON
 #undef N2N_HAVE_SETUID
 #else

win32/wintap.c

@@ -22,6 +22,7 @@ void initWin32() {
 }
 
 int open_wintap(struct tuntap_dev *device,
+                const char * devname,
                 const char * address_mode, /* "static" or "dhcp" */
                 char *device_ip, 
                 char *device_mask,
@@ -40,7 +41,7 @@ int open_wintap(struct tuntap_dev *device,
 
   memset(device, 0, sizeof(struct tuntap_dev));
   device->device_handle = INVALID_HANDLE_VALUE;
-  device->device_name = NULL;
+  device->device_name = devname[0] ? devname : NULL;
   device->ifName = NULL;
   device->ip_addr = inet_addr(device_ip);
 
@@ -262,7 +263,7 @@ int tuntap_open(struct tuntap_dev *device,
                 char *device_mask, 
                 const char * device_mac, 
                 int mtu) {
-    return(open_wintap(device, address_mode, device_ip, device_mask, device_mac, mtu));
+    return(open_wintap(device, dev, address_mode, device_ip, device_mask, device_mac, mtu));
 }
 
 /* ************************************************ */